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Improvement of durability and corrosion resistance of metal evaporated tape with chemically deposited SiOx overcoat

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4 Author(s)
Daimon, H. ; Tsukuba Res. Lab., Hitachi Maxell Ltd., Ibaraki, Japan ; Sugiyama, Y. ; Ichijo, M. ; Mizumura, T.

To improve the reliability of metal evaporated tape (ME tape), SiO x overcoat was investigated. The durability of ME tape overcoated with SiOx was greatly improved by lubricating with C18H37OP(H)(O)OH (mono octadecyl phosphite: MOP), which showed more than 10 hours life time in a still mode durability test (relative speed of head to media: 11.3 m/s). Since MOP was solid at room temperature, adhesion did not occur and friction force during the test reduced by 25% compared with perfluoropolyether liquid lubricant. Corrosion of ME tape was prevented by SiOx overcoat prepared by plasma enhanced chemical vapor deposition (PECVD). Water transmission rate of PECVD-SiOx was one tenth that of physically deposited SiOx, which suppressed surface corrosion of ME tape in an atmosphere of 60°C 90%R.H. and of 4 ppm SO2 (40°C 80%R.H.)

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )